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ELECTRICAL
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CONNECTION DIAGRAM
CONNECTION DETAILS OF PIN
IMMOBILIZER CONNECTOR
INSTRUMENT CLUSTERCONNECTOR
Status bulb Pin -5
Pin 20
IMMOBILIZER CONNECTOR
EMS VEHICLE CONNECTOR PIN NO.
DIESEL
PETROL
CAN_H Pin 3
Pin 19
Pin 19
CAN_L Pin 8
Pin18
Pin18
IMMOBILIZER CONNECTOR & PIN OUT DETAILS XE - 4 PIN CONNECTOR
PIN
SIGNAL NAME
USED
LEVEL
NOMINAL OPERATING CURRENT AT 13.5V
1
LIN
Y
500 µA
2
INTERNAL_12V
Y
HIGH
100 mA
3
-
N
NA
4
GND
Y
NA
Key ring illumination
Immobilizer earthing
PIN
SIGNAL NAME
PIN
SIGNAL NAME
1
KEY RING SUPPLY
1
IMMO GND
2
GND
2
IMMOBILIZER WORKING PRINCIPLE
The EMS ECU and the immobilizer are paired together by an encrypted secret code called as “AES secret
key”, to improve the security of the vehicle. This AES secret key is generated using the vehicle identification
number (VIN) and it is unique for each vehicle. Both immobilizer and the EMS ECU are programmed with
same secret key for mutual authentication. If any one of EMS or ICU has different/ wrong secret key, vehicle
will be locked (engine cannot be started).
If EMS or Immobilizer is changed in a vehicle, it is required pairing operation (EMS ECU & ICU programmed
with same secret key) for proper mutual authentication. The pairing of EMS and Immobilizer can be done
through diagnostic tester.
These E-keys are learned for that immobilizer and are unique to that Immobilizer & vehicle. The E-key of other
vehicles will not work with this immobilizer and vice versa.
If anyone of the E-key is lost, it is recommended to approach TATA AUTHORIZED dealer for new E-key. It is
possible to learn new keys with the help of diagnostic tester (Refer the key learning procedure). If both the
keys are lost, it is not be possible to learn the new keys for that immobilizer, as original key is required during
E-key learning operation.
IMMOBILIZER SYSTEM STATUS
During Ignition off, immobilizer status bulb (“Lock” symbol on the instrument cluster) blinks, indicating
Immobilizer is awaiting E-key.
When the ignition key is turned to the “ON” position, if the status bulb goes OFF indicates that the
system is working and the vehicle is unlocked (Engine is ready to start). If the status bulb is continuously
ON, there may be something wrong with key or with the immobilizer system.